Hi, I have one absurd problem with one of the machines in my network. Scenario: I have Exchange Server 5.5 with SP4. The client machine is running Outlook 97. When I connect to Exchange Server, it connects within 2 seconds. The problem occurs afterward. While sending a new message, upon clicking the TO button to open the address book, it does not show anything and says "Networking Problems are preventing you from connecting to the Exchange Server". When I restart Outlook again, it starts working. Any Ideas Please! Regards, Chand Deshwal (M.Tech CS&E, MCSE, CCNA) Network Administrator Kampsax India Ltd., Gurgaon ph: +91 124 6348259-62, Extn. 712 chand@xxxxxxxxxxxxxxxxx <mailto:chand@xxxxxxxxxxxxxxxxx> http://www.kampsaxindia.com <http://www.kampsaxindia.com/>